package com.example.eduservice.service.impl;

import com.alibaba.excel.EasyExcel;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.example.eduservice.entity.EduSubject;
import com.example.eduservice.entity.excel.SubjectData;
import com.example.eduservice.entity.subject.OneSubject;
import com.example.eduservice.entity.subject.TwoSubject;
import com.example.eduservice.listener.SubjectExcelListener;
import com.example.eduservice.mapper.EduSubjectMapper;
import com.example.eduservice.service.EduSubjectService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 * 课程科目 服务实现类
 * </p>
 *
 * @author testjava
 * @since 2021-08-29
 */
@Service
public class EduSubjectServiceImpl extends ServiceImpl<EduSubjectMapper, EduSubject> implements EduSubjectService {

    @Override
    public void saveSubject(MultipartFile file,EduSubjectService subjectService) {

      try {
          //文件输入流
          InputStream in=file.getInputStream();
          //调用方法进行读取
          EasyExcel.read(in, SubjectData.class,new SubjectExcelListener(subjectService)).sheet().doRead();

      }catch (Exception e){
          e.printStackTrace();
      }
    }
    //课程分类列表（树形）
    @Override
    public List<OneSubject> getAllOneTwoSubject() {
           //1、查询所有一级分类  parent_id=0
        QueryWrapper<EduSubject> wrapperOne=new QueryWrapper<>();
        wrapperOne.eq("parent_id","0");
        List<EduSubject> oneSubjectlist = baseMapper.selectList(wrapperOne);

        //2、查询所有二级分类，parent_id!=0
        QueryWrapper<EduSubject> wrapperTwo=new QueryWrapper<>();
        wrapperOne.ne("parent_id","0");
        List<EduSubject> twoSubjectlist = baseMapper.selectList(wrapperTwo);

        //创建list集合，用于存储最终封装数据
        List<OneSubject> finalSubjectList=new ArrayList<>();

        //3、封装一级分类
        //查询出所有的一级分类list集合遍历，得到每一个分类对象，获取每一个分类对象值
        //封装到要求的list集合里面   List<OneSubject> finalSubjectList
        for (int i = 0; i < oneSubjectlist.size(); i++) {
             EduSubject eduSubject=oneSubjectlist.get(i);
             OneSubject oneSubject=new OneSubject();
//             oneSubject.setId(eduSubject.getId());
//             oneSubject.setTitle(eduSubject.getTitle());
            //把eduSubject复制到对应oneSubject对象里面
            BeanUtils.copyProperties(eduSubject,oneSubject);

             finalSubjectList.add(oneSubject);

            //4、封装二级分类
             //在一级分类循环遍历查询所有的二级分类
            //创建一个list集合封装每一个一级分类的二级分类
            List<TwoSubject> twoFinalSubjectList=new ArrayList<>();
            //遍历二级分类list集合
            for (int m = 0; m < twoSubjectlist.size(); m++) {
                //获取每一个二级分类
                EduSubject tSubject = twoSubjectlist.get(m);
               //判断二级分类parent_id和一级分类id是否一样
                if(tSubject.getParentId().equals(eduSubject.getId())){
                    //一样，则把tSubject复制到TwoSubject里面，放到twoFinlSubjectList里面
                     TwoSubject twoSubject=new TwoSubject();
                     BeanUtils.copyProperties(tSubject,twoSubject);
                     twoFinalSubjectList.add(twoSubject);
                }
            }

       //把一级下面所有二级分类放到一级分类里面
            oneSubject.setChildren(twoFinalSubjectList);
        }
        return finalSubjectList;
    }





}
